Removed UI.
[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / ui / wizards / dialogfields / TreeListDialogField.java
diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/wizards/dialogfields/TreeListDialogField.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/ui/wizards/dialogfields/TreeListDialogField.java
deleted file mode 100644 (file)
index d1ae767..0000000
+++ /dev/null
@@ -1,896 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2000, 2003 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials 
- * are made available under the terms of the Common Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/cpl-v10.html
- * 
- * Contributors:
- *     IBM Corporation - initial API and implementation
- *******************************************************************************/
-package net.sourceforge.phpdt.internal.ui.wizards.dialogfields;
-
-import java.util.ArrayList;
-import java.util.Iterator;
-import java.util.List;
-
-import net.sourceforge.phpdt.internal.ui.util.PixelConverter;
-import net.sourceforge.phpdt.internal.ui.util.SWTUtil;
-
-import org.eclipse.jface.util.Assert;
-import org.eclipse.jface.viewers.DoubleClickEvent;
-import org.eclipse.jface.viewers.IDoubleClickListener;
-import org.eclipse.jface.viewers.ILabelProvider;
-import org.eclipse.jface.viewers.ISelection;
-import org.eclipse.jface.viewers.ISelectionChangedListener;
-import org.eclipse.jface.viewers.IStructuredSelection;
-import org.eclipse.jface.viewers.ITreeContentProvider;
-import org.eclipse.jface.viewers.SelectionChangedEvent;
-import org.eclipse.jface.viewers.StructuredSelection;
-import org.eclipse.jface.viewers.TreeViewer;
-import org.eclipse.jface.viewers.Viewer;
-import org.eclipse.jface.viewers.ViewerSorter;
-import org.eclipse.swt.SWT;
-import org.eclipse.swt.events.KeyAdapter;
-import org.eclipse.swt.events.KeyEvent;
-import org.eclipse.swt.events.SelectionEvent;
-import org.eclipse.swt.events.SelectionListener;
-import org.eclipse.swt.layout.GridData;
-import org.eclipse.swt.layout.GridLayout;
-import org.eclipse.swt.widgets.Button;
-import org.eclipse.swt.widgets.Composite;
-import org.eclipse.swt.widgets.Control;
-import org.eclipse.swt.widgets.Display;
-import org.eclipse.swt.widgets.Label;
-import org.eclipse.swt.widgets.Tree;
-
-
-/**
- * A list with a button bar.
- * Typical buttons are 'Add', 'Remove', 'Up' and 'Down'.
- * List model is independend of widget creation.
- * DialogFields controls are: Label, List and Composite containing buttons.
- */
-public class TreeListDialogField extends DialogField {
-
-       protected TreeViewer fTree;
-       protected ILabelProvider fLabelProvider;
-       protected TreeViewerAdapter fTreeViewerAdapter;
-       protected List fElements;
-       protected ViewerSorter fViewerSorter;
-
-       protected String[] fButtonLabels;
-       private Button[] fButtonControls;
-
-       private boolean[] fButtonsEnabled;
-
-       private int fRemoveButtonIndex;
-       private int fUpButtonIndex;
-       private int fDownButtonIndex;
-
-       private Label fLastSeparator;
-
-       private Tree fTreeControl;
-       private Composite fButtonsControl;
-       private ISelection fSelectionWhenEnabled;
-
-       private ITreeListAdapter fTreeAdapter;
-
-       private Object fParentElement;
-       private int fTreeExpandLevel;
-
-       /**
-        * @param adapter Can be <code>null</code>.
-        */
-       public TreeListDialogField(ITreeListAdapter adapter, String[] buttonLabels, ILabelProvider lprovider) {
-               super();
-               fTreeAdapter= adapter;
-
-               fLabelProvider= lprovider;
-               fTreeViewerAdapter= new TreeViewerAdapter();
-               fParentElement= this;
-
-               fElements= new ArrayList(10);
-
-               fButtonLabels= buttonLabels;
-               if (fButtonLabels != null) {
-                       int nButtons= fButtonLabels.length;
-                       fButtonsEnabled= new boolean[nButtons];
-                       for (int i= 0; i < nButtons; i++) {
-                               fButtonsEnabled[i]= true;
-                       }
-               }
-
-               fTree= null;
-               fTreeControl= null;
-               fButtonsControl= null;
-
-               fRemoveButtonIndex= -1;
-               fUpButtonIndex= -1;
-               fDownButtonIndex= -1;
-               
-               fTreeExpandLevel= 0;
-       }
-
-       /**
-       * Sets the index of the 'remove' button in the button label array passed in
-       * the constructor. The behaviour of the button marked as the 'remove' button
-       * will then behandled internally. (enable state, button invocation
-       * behaviour)
-       */
-       public void setRemoveButtonIndex(int removeButtonIndex) {
-               Assert.isTrue(removeButtonIndex < fButtonLabels.length);
-               fRemoveButtonIndex= removeButtonIndex;
-       }
-
-       /**
-       * Sets the index of the 'up' button in the button label array passed in the
-       * constructor. The behaviour of the button marked as the 'up' button will
-       * then behandled internally.
-       * (enable state, button invocation behaviour)
-       */
-       public void setUpButtonIndex(int upButtonIndex) {
-               Assert.isTrue(upButtonIndex < fButtonLabels.length);
-               fUpButtonIndex= upButtonIndex;
-       }
-
-       /**
-       * Sets the index of the 'down' button in the button label array passed in
-       * the constructor. The behaviour of the button marked as the 'down' button
-       * will then be handled internally. (enable state, button invocation
-       * behaviour)
-       */
-       public void setDownButtonIndex(int downButtonIndex) {
-               Assert.isTrue(downButtonIndex < fButtonLabels.length);
-               fDownButtonIndex= downButtonIndex;
-       }
-
-       /**
-       * Sets the viewerSorter.
-       * @param viewerSorter The viewerSorter to set
-       */
-       public void setViewerSorter(ViewerSorter viewerSorter) {
-               fViewerSorter= viewerSorter;
-       }
-       
-       /**
-       * Sets the viewerSorter.
-       * @param viewerSorter The viewerSorter to set
-       */
-       public void setTreeExpansionLevel(int level) {
-               fTreeExpandLevel= level;
-               if (fTree != null) {
-                       fTree.expandToLevel(level);
-               }
-       }       
-
-       // ------ adapter communication
-
-       private void buttonPressed(int index) {
-               if (!managedButtonPressed(index) && fTreeAdapter != null) {
-                       fTreeAdapter.customButtonPressed(this, index);
-               }
-       }
-
-       /**
-       * Checks if the button pressed is handled internally
-       * @return Returns true if button has been handled.
-       */
-       protected boolean managedButtonPressed(int index) {
-               if (index == fRemoveButtonIndex) {
-                       remove();
-               } else if (index == fUpButtonIndex) {
-                       up();
-               } else if (index == fDownButtonIndex) {
-                       down();
-               } else {
-                       return false;
-               }
-               return true;
-       }
-
-       // ------ layout helpers
-
-       /*
-       * @see DialogField#doFillIntoGrid
-       */
-       public Control[] doFillIntoGrid(Composite parent, int nColumns) {
-               PixelConverter converter= new PixelConverter(parent);
-
-               assertEnoughColumns(nColumns);
-
-               Label label= getLabelControl(parent);
-               GridData gd= gridDataForLabel(1);
-               gd.verticalAlignment= GridData.BEGINNING;
-               label.setLayoutData(gd);
-
-               Control list= getTreeControl(parent);
-               gd= new GridData();
-               gd.horizontalAlignment= GridData.FILL;
-               gd.grabExcessHorizontalSpace= false;
-               gd.verticalAlignment= GridData.FILL;
-               gd.grabExcessVerticalSpace= true;
-               gd.horizontalSpan= nColumns - 2;
-               gd.widthHint= converter.convertWidthInCharsToPixels(50);
-               gd.heightHint= converter.convertHeightInCharsToPixels(6);
-
-               list.setLayoutData(gd);
-
-               Composite buttons= getButtonBox(parent);
-               gd= new GridData();
-               gd.horizontalAlignment= GridData.FILL;
-               gd.grabExcessHorizontalSpace= false;
-               gd.verticalAlignment= GridData.FILL;
-               gd.grabExcessVerticalSpace= true;
-               gd.horizontalSpan= 1;
-               buttons.setLayoutData(gd);
-
-               return new Control[] { label, list, buttons };
-       }
-
-       /*
-       * @see DialogField#getNumberOfControls
-       */
-       public int getNumberOfControls() {
-               return 3;
-       }
-
-       /**
-       * Sets the minimal width of the buttons. Must be called after widget creation.
-       */
-       public void setButtonsMinWidth(int minWidth) {
-               if (fLastSeparator != null) {
-                       ((GridData) fLastSeparator.getLayoutData()).widthHint= minWidth;
-               }
-       }
-
-       // ------ ui creation
-
-       /**
-       * Returns the tree control. When called the first time, the control will be
-       * created.
-       * @param The parent composite when called the first time, or <code>null</code>
-       * after.
-       */
-       public Control getTreeControl(Composite parent) {
-               if (fTreeControl == null) {
-                       assertCompositeNotNull(parent);
-
-                       fTree= createTreeViewer(parent);
-
-                       fTreeControl= (Tree) fTree.getControl();
-                       fTreeControl.addKeyListener(new KeyAdapter() {
-                               public void keyPressed(KeyEvent e) {
-                                       handleKeyPressed(e);
-                               }
-                       });
-                       fTree.setAutoExpandLevel(99);
-                       fTree.setContentProvider(fTreeViewerAdapter);
-                       fTree.setLabelProvider(fLabelProvider);
-                       fTree.addSelectionChangedListener(fTreeViewerAdapter);
-                       fTree.addDoubleClickListener(fTreeViewerAdapter);
-
-                       fTree.setInput(fParentElement);
-                       fTree.expandToLevel(fTreeExpandLevel);
-
-                       if (fViewerSorter != null) {
-                               fTree.setSorter(fViewerSorter);
-                       }
-
-                       fTreeControl.setEnabled(isEnabled());
-                       if (fSelectionWhenEnabled != null) {
-                               postSetSelection(fSelectionWhenEnabled);
-                       }
-               }
-               return fTreeControl;
-       }
-
-       /**
-       * Returns the internally used table viewer.
-       */
-       public TreeViewer getTreeViewer() {
-               return fTree;
-       }
-
-       /*
-       * Subclasses may override to specify a different style.
-       */
-       protected int getTreeStyle() {
-               int style= SWT.BORDER | SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL;
-               return style;
-       }
-
-       protected TreeViewer createTreeViewer(Composite parent) {
-               Tree tree= new Tree(parent, getTreeStyle());
-               return new TreeViewer(tree);
-       }
-
-       protected Button createButton(Composite parent, String label, SelectionListener listener) {
-               Button button= new Button(parent, SWT.PUSH);
-               button.setText(label);
-               button.addSelectionListener(listener);
-               GridData gd= new GridData();
-               gd.horizontalAlignment= GridData.FILL;
-               gd.grabExcessHorizontalSpace= true;
-               gd.verticalAlignment= GridData.BEGINNING;
-               gd.heightHint= SWTUtil.getButtonHeigthHint(button);
-               gd.widthHint= SWTUtil.getButtonWidthHint(button);
-
-               button.setLayoutData(gd);
-               return button;
-       }
-
-       private Label createSeparator(Composite parent) {
-               Label separator= new Label(parent, SWT.NONE);
-               separator.setVisible(false);
-               GridData gd= new GridData();
-               gd.horizontalAlignment= GridData.FILL;
-               gd.verticalAlignment= GridData.BEGINNING;
-               gd.heightHint= 4;
-               separator.setLayoutData(gd);
-               return separator;
-       }
-
-       /**
-       * Returns the composite containing the buttons. When called the first time, the control
-       * will be created.
-       * @param The parent composite when called the first time, or <code>null</code>
-       * after.
-       */
-       public Composite getButtonBox(Composite parent) {
-               if (fButtonsControl == null) {
-                       assertCompositeNotNull(parent);
-
-                       SelectionListener listener= new SelectionListener() {
-                               public void widgetDefaultSelected(SelectionEvent e) {
-                                       doButtonSelected(e);
-                               }
-                               public void widgetSelected(SelectionEvent e) {
-                                       doButtonSelected(e);
-                               }
-                       };
-
-                       Composite contents= new Composite(parent, SWT.NULL);
-                       GridLayout layout= new GridLayout();
-                       layout.marginWidth= 0;
-                       layout.marginHeight= 0;
-                       contents.setLayout(layout);
-
-                       if (fButtonLabels != null) {
-                               fButtonControls= new Button[fButtonLabels.length];
-                               for (int i= 0; i < fButtonLabels.length; i++) {
-                                       String currLabel= fButtonLabels[i];
-                                       if (currLabel != null) {
-                                               fButtonControls[i]= createButton(contents, currLabel, listener);
-                                               fButtonControls[i].setEnabled(isEnabled() && fButtonsEnabled[i]);
-                                       } else {
-                                               fButtonControls[i]= null;
-                                               createSeparator(contents);
-                                       }
-                               }
-                       }
-
-                       fLastSeparator= createSeparator(contents);
-
-                       updateButtonState();
-                       fButtonsControl= contents;
-               }
-
-               return fButtonsControl;
-       }
-
-       private void doButtonSelected(SelectionEvent e) {
-               if (fButtonControls != null) {
-                       for (int i= 0; i < fButtonControls.length; i++) {
-                               if (e.widget == fButtonControls[i]) {
-                                       buttonPressed(i);
-                                       return;
-                               }
-                       }
-               }
-       }
-
-       /**
-       * Handles key events in the table viewer. Specifically
-       * when the delete key is pressed.
-       */
-       protected void handleKeyPressed(KeyEvent event) {
-               if (event.character == SWT.DEL && event.stateMask == 0) {
-                       if (fRemoveButtonIndex != -1 && isButtonEnabled(fTree.getSelection(), fRemoveButtonIndex)) {
-                               managedButtonPressed(fRemoveButtonIndex);
-                               return;
-                       }
-               }
-               fTreeAdapter.keyPressed(this, event);
-       }
-
-       // ------ enable / disable management
-
-       /*
-       * @see DialogField#dialogFieldChanged
-       */
-       public void dialogFieldChanged() {
-               super.dialogFieldChanged();
-               updateButtonState();
-       }
-
-       /*
-       * Updates the enable state of the all buttons
-       */
-       protected void updateButtonState() {
-               if (fButtonControls != null) {
-                       ISelection sel= fTree.getSelection();
-                       for (int i= 0; i < fButtonControls.length; i++) {
-                               Button button= fButtonControls[i];
-                               if (isOkToUse(button)) {
-                                       button.setEnabled(isButtonEnabled(sel, i));
-                               }
-                       }
-               }
-       }
-       
-       
-       protected boolean containsAttributes(List selected) {
-               for (int i= 0; i < selected.size(); i++) {
-                       if (!fElements.contains(selected.get(i))) {
-                               return true;
-                       }
-               }
-               return false;
-       }
-       
-
-       protected boolean getManagedButtonState(ISelection sel, int index) {
-               List selected= getSelectedElements();
-               boolean hasAttributes= containsAttributes(selected);
-               if (index == fRemoveButtonIndex) {
-                       return !selected.isEmpty() && !hasAttributes;
-               } else if (index == fUpButtonIndex) {
-                       return !sel.isEmpty() && !hasAttributes && canMoveUp(selected);
-               } else if (index == fDownButtonIndex) {
-                       return !sel.isEmpty() && !hasAttributes && canMoveDown(selected);
-               }
-               return true;
-       }
-
-       /*
-       * @see DialogField#updateEnableState
-       */
-       protected void updateEnableState() {
-               super.updateEnableState();
-
-               boolean enabled= isEnabled();
-               if (isOkToUse(fTreeControl)) {
-                       if (!enabled) {
-                               fSelectionWhenEnabled= fTree.getSelection();
-                               selectElements(null);
-                       } else {
-                               selectElements(fSelectionWhenEnabled);
-                               fSelectionWhenEnabled= null;
-                       }
-                       fTreeControl.setEnabled(enabled);
-               }
-               updateButtonState();
-       }
-
-       /**
-       * Sets a button enabled or disabled.
-       */
-       public void enableButton(int index, boolean enable) {
-               if (fButtonsEnabled != null && index < fButtonsEnabled.length) {
-                       fButtonsEnabled[index]= enable;
-                       updateButtonState();
-               }
-       }
-
-       private boolean isButtonEnabled(ISelection sel, int index) {
-               boolean extraState= getManagedButtonState(sel, index);
-               return isEnabled() && extraState && fButtonsEnabled[index];
-       }
-
-       // ------ model access
-
-       /**
-       * Sets the elements shown in the list.
-       */
-       public void setElements(List elements) {
-               fElements= new ArrayList(elements);
-               refresh();
-               if (fTree != null) {
-                       fTree.expandToLevel(fTreeExpandLevel);
-               }
-               dialogFieldChanged();
-       }
-
-       /**
-       * Gets the elements shown in the list.
-       * The list returned is a copy, so it can be modified by the user.
-       */
-       public List getElements() {
-               return new ArrayList(fElements);
-       }
-
-       /**
-       * Gets the element shown at the given index.
-       */
-       public Object getElement(int index) {
-               return fElements.get(index);
-       }
-       
-       /**
-       * Gets the index of an element in the list or -1 if element is not in list.
-    */
-       public int getIndexOfElement(Object elem) {
-               return fElements.indexOf(elem);
-       }       
-
-       /**
-       * Replace an element.
-       */
-       public void replaceElement(Object oldElement, Object newElement) throws IllegalArgumentException {
-               int idx= fElements.indexOf(oldElement);
-               if (idx != -1) {
-                       fElements.set(idx, newElement);
-                       if (fTree != null) {
-                               List selected= getSelectedElements();
-                               if (selected.remove(oldElement)) {
-                                       selected.add(newElement);
-                               }
-                               boolean isExpanded= fTree.getExpandedState(oldElement);
-                               fTree.remove(oldElement);
-                               fTree.add(fParentElement, newElement);
-                               if (isExpanded) {
-                                       fTree.expandToLevel(newElement, fTreeExpandLevel);
-                               }
-                               selectElements(new StructuredSelection(selected));
-                       }
-                       dialogFieldChanged();
-               } else {
-                       throw new IllegalArgumentException();
-               }
-       }
-
-       /**
-       * Adds an element at the end of the tree list.
-       */
-       public void addElement(Object element) {
-               if (fElements.contains(element)) {
-                       return;
-               }
-               fElements.add(element);
-               if (fTree != null) {
-                       fTree.add(fParentElement, element);
-                       fTree.expandToLevel(element, fTreeExpandLevel);
-               }
-               dialogFieldChanged();
-       }
-
-       /**
-       * Adds elements at the end of the tree list.
-       */
-       public void addElements(List elements) {
-               int nElements= elements.size();
-
-               if (nElements > 0) {
-                       // filter duplicated
-                       ArrayList elementsToAdd= new ArrayList(nElements);
-
-                       for (int i= 0; i < nElements; i++) {
-                               Object elem= elements.get(i);
-                               if (!fElements.contains(elem)) {
-                                       elementsToAdd.add(elem);
-                               }
-                       }
-                       fElements.addAll(elementsToAdd);
-                       if (fTree != null) {
-                               fTree.add(fParentElement, elementsToAdd.toArray());
-                               for (int i= 0; i < elementsToAdd.size(); i++) {
-                                       fTree.expandToLevel(elementsToAdd.get(i), fTreeExpandLevel);
-                               }
-                       }
-                       dialogFieldChanged();
-               }
-       }
-
-       /**
-       * Adds an element at a position.
-       */
-       public void insertElementAt(Object element, int index) {
-               if (fElements.contains(element)) {
-                       return;
-               }
-               fElements.add(index, element);
-               if (fTree != null) {
-                       fTree.add(fParentElement, element);
-                       if (fTreeExpandLevel != -1) {
-                               fTree.expandToLevel(element, fTreeExpandLevel);
-                       }
-               }
-
-               dialogFieldChanged();
-       }
-
-       /**
-       * Adds an element at a position.
-       */
-       public void removeAllElements() {
-               if (fElements.size() > 0) {
-                       fElements.clear();
-                       refresh();
-                       dialogFieldChanged();
-               }
-       }
-
-       /**
-       * Removes an element from the list.
-       */
-       public void removeElement(Object element) throws IllegalArgumentException {
-               if (fElements.remove(element)) {
-                       if (fTree != null) {
-                               fTree.remove(element);
-                       }
-                       dialogFieldChanged();
-               } else {
-                       throw new IllegalArgumentException();
-               }
-       }
-
-       /**
-       * Removes elements from the list.
-       */
-       public void removeElements(List elements) {
-               if (elements.size() > 0) {
-                       fElements.removeAll(elements);
-                       if (fTree != null) {
-                               fTree.remove(elements.toArray());
-                       }
-                       dialogFieldChanged();
-               }
-       }
-
-       /**
-       * Gets the number of elements
-       */
-       public int getSize() {
-               return fElements.size();
-       }
-
-       public void selectElements(ISelection selection) {
-               fSelectionWhenEnabled= selection;
-               if (fTree != null) {
-                       fTree.setSelection(selection, true);
-               }
-       }
-
-       public void selectFirstElement() {
-               Object element= null;
-               if (fViewerSorter != null) {
-                       Object[] arr= fElements.toArray();
-                       fViewerSorter.sort(fTree, arr);
-                       if (arr.length > 0) {
-                               element= arr[0];
-                       }
-               } else {
-                       if (fElements.size() > 0) {
-                               element= fElements.get(0);
-                       }
-               }
-               if (element != null) {
-                       selectElements(new StructuredSelection(element));
-               }
-       }
-
-       public void postSetSelection(final ISelection selection) {
-               if (isOkToUse(fTreeControl)) {
-                       Display d= fTreeControl.getDisplay();
-                       d.asyncExec(new Runnable() {
-                               public void run() {
-                                       if (isOkToUse(fTreeControl)) {
-                                               selectElements(selection);
-                                       }
-                               }
-                       });
-               }
-       }
-
-       /**
-       * Refreshes the tree.
-       */
-       public void refresh() {
-               if (fTree != null) {
-                       fTree.refresh();
-               }
-       }
-       
-       /**
-       * Refreshes the tree.
-       */
-       public void refresh(Object element) {
-               if (fTree != null) {
-                       fTree.refresh(element);
-               }
-       }       
-
-       // ------- list maintenance
-
-       private List moveUp(List elements, List move) {
-               int nElements= elements.size();
-               List res= new ArrayList(nElements);
-               Object floating= null;
-               for (int i= 0; i < nElements; i++) {
-                       Object curr= elements.get(i);
-                       if (move.contains(curr)) {
-                               res.add(curr);
-                       } else {
-                               if (floating != null) {
-                                       res.add(floating);
-                               }
-                               floating= curr;
-                       }
-               }
-               if (floating != null) {
-                       res.add(floating);
-               }
-               return res;
-       }
-
-       private void moveUp(List toMoveUp) {
-               if (toMoveUp.size() > 0) {
-                       setElements(moveUp(fElements, toMoveUp));
-                       fTree.reveal(toMoveUp.get(0));
-               }
-       }
-
-       private void moveDown(List toMoveDown) {
-               if (toMoveDown.size() > 0) {
-                       setElements(reverse(moveUp(reverse(fElements), toMoveDown)));
-                       fTree.reveal(toMoveDown.get(toMoveDown.size() - 1));
-               }
-       }
-
-       private List reverse(List p) {
-               List reverse= new ArrayList(p.size());
-               for (int i= p.size() - 1; i >= 0; i--) {
-                       reverse.add(p.get(i));
-               }
-               return reverse;
-       }
-
-       private void remove() {
-               removeElements(getSelectedElements());
-       }
-
-       private void up() {
-               moveUp(getSelectedElements());
-       }
-
-       private void down() {
-               moveDown(getSelectedElements());
-       }
-
-       private boolean canMoveUp(List selectedElements) {
-               if (isOkToUse(fTreeControl)) {
-                       int nSelected= selectedElements.size();
-                       int nElements= fElements.size();
-                       for (int i= 0; i < nElements && nSelected > 0; i++) {
-                               if (!selectedElements.contains(fElements.get(i))) {
-                                       return true;
-                               }
-                               nSelected--;
-                       }
-               }
-               return false;
-       }
-
-       private boolean canMoveDown(List selectedElements) {
-               if (isOkToUse(fTreeControl)) {
-                       int nSelected= selectedElements.size();                 
-                       for (int i= fElements.size() - 1; i >= 0 && nSelected > 0; i--) {
-                               if (!selectedElements.contains(fElements.get(i))) {
-                                       return true;
-                               }
-                               nSelected--;                            
-                       }
-               }
-               return false;
-       }
-
-       /**
-       * Returns the selected elements.
-       */
-       public List getSelectedElements() {
-               ArrayList result= new ArrayList();
-               if (fTree != null) {
-                       ISelection selection= fTree.getSelection();
-                       if (selection instanceof IStructuredSelection) {
-                               Iterator iter= ((IStructuredSelection)selection).iterator();
-                               while (iter.hasNext()) {
-                                       result.add(iter.next());
-                               }
-                       }
-               }
-               return result;
-       }
-       
-       public void expandElement(Object element, int level) {
-               if (fTree != null) {
-                       fTree.expandToLevel(element, level);
-               }
-       }
-       
-
-       // ------- TreeViewerAdapter
-
-       private class TreeViewerAdapter implements ITreeContentProvider, ISelectionChangedListener, IDoubleClickListener {
-
-               private final Object[] NO_ELEMENTS= new Object[0];
-
-               // ------- ITreeContentProvider Interface ------------
-
-               public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
-                       // will never happen
-               }
-
-               public boolean isDeleted(Object element) {
-                       return false;
-               }
-
-               public void dispose() {
-               }
-
-               public Object[] getElements(Object obj) {
-                       return fElements.toArray();
-               }
-               
-               public Object[] getChildren(Object element) {
-                       if (fTreeAdapter != null) {
-                               return fTreeAdapter.getChildren(TreeListDialogField.this, element);
-                       }
-                       return NO_ELEMENTS;
-               }
-
-               public Object getParent(Object element) {
-                       if (!fElements.contains(element) && fTreeAdapter != null) {
-                               return fTreeAdapter.getParent(TreeListDialogField.this, element);
-                       }
-                       return fParentElement;
-               }
-
-               public boolean hasChildren(Object element) {
-                       if (fTreeAdapter != null) {
-                               return fTreeAdapter.hasChildren(TreeListDialogField.this, element);
-                       }
-                       return false;
-               }               
-
-               // ------- ISelectionChangedListener Interface ------------
-
-               public void selectionChanged(SelectionChangedEvent event) {
-                       doListSelected(event);
-               }
-               
-               /* (non-Javadoc)
-                * @see org.eclipse.jface.viewers.IDoubleClickListener#doubleClick(org.eclipse.jface.viewers.DoubleClickEvent)
-                */
-               public void doubleClick(DoubleClickEvent event) {
-                       doDoubleClick(event);
-               }               
-
-       }
-
-       protected void doListSelected(SelectionChangedEvent event) {
-               updateButtonState();
-               if (fTreeAdapter != null) {
-                       fTreeAdapter.selectionChanged(this);
-               }
-       }
-       
-       protected void doDoubleClick(DoubleClickEvent event) {
-               if (fTreeAdapter != null) {
-                       fTreeAdapter.doubleClicked(this);
-               }
-       }
-
-       
-
-}